Radio telephone receiver



Aug. 5-, 1924.

M. s. FINLEY RADIO TELEPHONE RECEIVER Filed July 10, 1922 Fly. 2.

mawsym z y mv lvm Patented 5, 1924.

UNITEDSTATES PATENT OFFICE.

MAX S. FINLEY, OF INDIANAIOLIS, INDIAN A.

namo TELEPHONE Application filed July 10, '1922. Serial 170. 573,987.

To all whom itmay concern:

. Be it known that I, Max S. FINLEY, a' citizen of the United States,residing at Indianapolis, in the county :of Marion and State of Indiana,have invented certain new and useful Improvements in Radio TelephoneReceivers, of which the following is a specification.

This invention has reference toradio phone receivers and its object isto reduce the cost of, such a receiver to an'extreme minimum so that theinstrument may be sold at an extremely low cost and yet prop vide aworkable device. 15 instruments and the high cost of such instru- Onaccount of the large demand for radio ments, especiallywith respect toreceivers, a demand has grown up for great .cheapnes's of production,and by the present invention, the. demand ismet at a cost bringing-thetotal expense of a radio receiving set of workable efficiency to anextremely low price. a

The result is that those who desire to listen in may install their ownradio sets at a cost so small that any one may invest therein and Vstill obtain results all out of proportion to the cost thereof.

The cost of the receiver is so small as to make it feasible to give awaysuch receivers as advertising devices, while still obtaining goodworkable results.

The invention will be from a consideration'of the following detaileddescription taken in connection with the accompanying drawing, formingpart of this specification, with the understanding that the invention isnot confined to any strict conformity to the showing of the drawings,but may be changed and modified so long as such changes andmodifications come within the scope of the appended claim.

In the drawings Fi re 1 is a perspective view of a radio telep onereceiver.

v Fig. 2 is a longitudinal central section therethrough. FFig. 3 is asection on the line 3--3 of ig. 2.

Reihrrin'g to the drawings, there is shown a cylinder 1 with caps 2, 3,at opposite ends.

Within the cylinder 1 there is another cylinder/4, the cylinder 1 beingin effect a simple sheet of paper. for containing advertisingmattrpwhile the'qylinder 4 is thick and stout instance, by tightness oi.fit,.thus doing with any additional expense in insta best understood.

enough to eifectively'resist handling and also to provide a ingpurposes, which insulating effect may be increased by coating theinterior of the cyl inder 4 with shellac or some other suitabiinsulatingmaterial.

The cap 2 is provided ing 5 of appropriate escape of sound waves, whilethe cap 3 is provided with an opening 6 to permit the passage of atwisted conductor 7 which latter is held in place against thecapB by aaster 8 or .in other suitable wigs.

Within thecylinder or bo y portion 4 with a central opensize. to permitthe there is lodged a permanent horse shoe mag net 9 which, because ofcheapness, may be, of the'familiar toy type and held in anysuitablemanner within the cylinder 4, as for away lation since such tightness ofinstallation will resist displacement due to handling.

Surrounding the olar ends 10 of the electromagnet 9 is a s eeve 11,which may he formed of paper, shellacked or otherwise stiffened, and onthe sleeve 11 is'wound a coil 12 of insulated wire of sufficient lengthand gage to-produce a coil of high resistance, say of one ohms, the wirebeingpreferably of number 44 gage.

The coil 12 is provided with terminal extensions 13 carried throughinsulating tubes 14 within the main tube 4 and there coupled to heavierconductors 15' forming part of the conductor 7.

Within the zone'of influence of the mag net 10 is a diaphragm 16 ofmagnetic material such as a sheet of soft iron such as is used intelephone receivers. The wires of the conductor 7 terminate in clips 15by means of which the radio receiver may he thickness sufiicient forinsulat thousand or two thousand electrically connected to an aerial orto wrdly extending annular flange inserted between the said walls a.horeshoe ,magnet secured within said'casmg, a coil surrounding theolesof said magnet and having the termina wires thereof passing outthroughthe aperture in one of sald heads, adiaphragm secured to andextending across the aperture in the other head,- and means forconnecting said terminal wires with a receivin% set.

n testimony whereof, I afiix my signature hereto. MAX S. FINLEY.

